JLSEC-2026-1042 Medium 4.8

ImageMagick before 7.1.2-19 contains an off-by-one error in morphology validation allowing out-of...

JLSEC Published: Jul 30, 2026
Modified: Jul 30, 2026
Severity: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Affected Packages: ImageMagick_jll < 7.1.2023+0
Upstream: CVE-2026-56361 GHSA-4h5w-9gq6-38f8 EUVD-2026-40445

ImageMagick before 7.1.2-19 contains an off-by-one error in morphology validation allowing out-of-bounds heap buffer reads. Attackers can trigger heap buffer overflow by providing incorrect morphology parameters causing single pixel memory access violations.

References

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q8h3-jv9v-57qx
https://github.com/advisories/GHSA-4h5w-9gq6-38f8
https://nvd.nist.gov/vuln/detail/CVE-2026-56361
https://www.vulncheck.com/advisories/imagemagick-heap-buffer-overflow-via-off-by-one-in-morphology-processing